Date in millis java

Java Convert Date to Milliseconds

In this Java core tutorial we learn how to convert a java.util.Date object into milliseconds value in Java programming language.

How to convert Date to milliseconds in Java

In Java we can use the Date.getTime() method to get the number of milliseconds since January 1, 1970, 00:00:00 GMT from a given Date object as following example Java code.

import java.util.Date; public class ConvertDateToMillisecondsExample1  public static void main(String. args)  Date date = new Date(); // Convert Date to milliseconds long milliseconds = date.getTime(); System.out.println("Date: " + date); System.out.println("Milliseconds: " + milliseconds); > >

Date: Sat Apr 16 16:39:12 ICT 2022 Milliseconds: 1650101952053

Источник

Convert Time to Milliseconds in Java

Repeatedly, code that works in dev breaks down in production. Java performance issues are difficult to track down or predict.

Simply put, Digma provides immediate code feedback. As an IDE plugin, it identifies issues with your code as it is currently running in test and prod.

The feedback is available from the minute you are writing it.

Imagine being alerted to any regression or code smell as you’re running and debugging locally. Also, identifying weak spots that need attending to, based on integration testing results.

Of course, Digma is free for developers.

As always, the writeup is super practical and based on a simple application that can work with documents with a mix of encrypted and unencrypted fields.

We rely on other people’s code in our own work. Every day.

It might be the language you’re writing in, the framework you’re building on, or some esoteric piece of software that does one thing so well you never found the need to implement it yourself.

The problem is, of course, when things fall apart in production — debugging the implementation of a 3rd party library you have no intimate knowledge of is, to say the least, tricky.

Lightrun is a new kind of debugger.

It’s one geared specifically towards real-life production environments. Using Lightrun, you can drill down into running applications, including 3rd party dependencies, with real-time logs, snapshots, and metrics.

Learn more in this quick, 5-minute Lightrun tutorial:

Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL.

The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries.

Critically, it has very minimal impact on your server’s performance, with most of the profiling work done separately — so it needs no server changes, agents or separate services.

Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you’ll have results within minutes:

DbSchema is a super-flexible database designer, which can take you from designing the DB with your team all the way to safely deploying the schema.

The way it does all of that is by using a design model, a database-independent image of the schema, which can be shared in a team using GIT and compared or deployed on to any database.

And, of course, it can be heavily visual, allowing you to interact with the database using diagrams, visually compose queries, explore the data, generate random data, import data or build HTML5 database reports.

Get started with Spring 5 and Spring Boot 2, through the Learn Spring course:

> CHECK OUT THE COURSE

1. Overview

In this quick tutorial, we’ll illustrate multiple ways of converting time into Unix-epoch milliseconds in Java.

More specifically, we’ll use:

• Core Java’s java.util.Date and Calendar
• Java 8’s Date and Time API
• Joda-Time library

2. Core Java

2.1. Using Date

Firstly, let’s define a millis property holding a random value of milliseconds:

long millis = 1556175797428L; // April 25, 2019 7:03:17.428 UTC

We’ll use this value to initialize our various objects and verify our results.

Next, let’s start with a Date object:

Date date = // implementation details

Now, we’re ready to convert the date into milliseconds by simply invoking the getTime() method:

Assert.assertEquals(millis, date.getTime());

2.2. Using Calendar

Likewise, if we have a Calendar object, we can use the getTimeInMillis() method:

Calendar calendar = // implementation details Assert.assertEquals(millis, calendar.getTimeInMillis());

3. Java 8 Date Time API

3.1. Using Instant

Simply put, Instant is a point in Java’s epoch timeline.

We can get the current time in milliseconds from the Instant:

java.time.Instant instant = // implementation details Assert.assertEquals(millis, instant.toEpochMilli());

As a result, the toEpochMilli() method returns the same number of milliseconds as we defined earlier.

3.2. Using LocalDateTime

Similarly, we can use Java 8’s Date and Time API to convert a LocalDateTime into milliseconds:

LocalDateTime localDateTime = // implementation details ZonedDateTime zdt = ZonedDateTime.of(localDateTime, ZoneId.systemDefault()); Assert.assertEquals(millis, zdt.toInstant().toEpochMilli());

First, we created an instance of the current date. After that, we used the toEpochMilli() method to convert the ZonedDateTime into milliseconds.

As we know, LocalDateTime doesn’t contain information about the time zone. In other words, we can’t get milliseconds directly from LocalDateTime instance.

4. Joda-Time

While Java 8 adds much of Joda-Time’s functionality, we may want to use this option if we are on Java 7 or earlier.

4.1. Using Instant

Firstly, we can obtain the current system milliseconds from the Joda-Time Instant class instance using the getMillis() method:

Instant jodaInstant = // implementation details Assert.assertEquals(millis, jodaInstant.getMillis());

4.2. Using DateTime

Additionally, if we have a Joda-Time DateTime instance:

DateTime jodaDateTime = // implementation details

Then we can retrieve the milliseconds with the getMillis() method:

Assert.assertEquals(millis, jodaDateTime.getMillis());

5. Conclusion

In conclusion, this article demonstrates how to convert time into milliseconds in Java.

Finally, as always, the complete code for this article is available over on GitHub.

Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL.

The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries.

Critically, it has very minimal impact on your server’s performance, with most of the profiling work done separately — so it needs no server changes, agents or separate services.

Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you’ll have results within minutes:

Источник

Java — Get Time In MilliSeconds

A quick guide to get the current date time in milliseconds using Date, Calendar and java 8 api classes.

1. Overview

In this tutorial, We’ll learn how to get the time in milliseconds in java. Time in milliseconds is the right way and format in storing into the database for date time columns. Because this is stored as Number type and which reduces the space than DateTime type in SQL.

Let us come to our topic today is getting the time milliseconds can be retrieved from Date, Calendar and java 8 api classes such Instant, ZonedDateTime classes.

2. Using java.util.Date

First, we’ll try with the simple way to get the time in milliseconds format is from Date class. Date class has a method getTime() which returns the milliseconds in long value for the given time or current time.

package com.javaprogramto.java8.dates.milliseconds; import java.util.Date; /** * Example to get time in milli seconds in java using util Date api * * @author JavaProgramTo.com * */ public class MilliSecondsFromDate < public static void main(String[] args) < // Getting the current date from Date class. Date currentDate = new Date(); // Getting the time in milliseconds. long milliSeconds = currentDate.getTime(); // printing the values System.out.println("Current date : "+currentDate); System.out.println("Current date time in milliseconds : "+milliSeconds); // Creating the future date Date futureDate = new Date(2025, 01, 01, 02, 30, 50); // Getting the future date milliSeconds = futureDate.getTime(); // printing the future date time values System.out.println("Future date : "+futureDate); System.out.println("Future date time in milliseconds : "+milliSeconds); >>

Current date : Sat Dec 12 21:48:25 IST 2020 Current date time in milliseconds : 1607789905027 Future date : Sun Feb 01 02:30:50 IST 3925 Future date time in milliseconds : 61696501250000

3. Using java.util.Calendar

Next, use the Calendar class to get the time in milli seconds. This class has a method getTimeInMillis() which returns the milliseconds for the time.

package com.javaprogramto.java8.dates.milliseconds; import java.util.Calendar; import java.util.Locale; /** * Example to get time in milli seconds in java using Calendar api * * @author JavaProgramTo.com * */ public class MilliSecondsFromCalendar < public static void main(String[] args) < // Getting the current date from Calendar class. Calendar calendar = Calendar.getInstance(); // Getting the time in milliseconds. long milliSeconds = calendar.getTimeInMillis(); // printing the values System.out.println("Current calender time in milliseconds : "+milliSeconds); // Creating another calendar object for Canada locale Calendar canadaLocale = Calendar.getInstance(Locale.CANADA); // Getting the future date milliSeconds = canadaLocale.getTimeInMillis(); // printing the future date time values System.out.println("Future date time in milliseconds : "+milliSeconds); >>

Current calender time in milliseconds : 1607790439838 Future date time in milliseconds : 1607790439859

4. Using Java 8 API

There are multiple ways to get the date time in milliseconds in java 8 date time api using Instant and ZonedDateTime classes.

package com.javaprogramto.java8.dates.milliseconds; import java.time.Instant; import java.time.ZonedDateTime; /** * Example to get time in milli seconds in java 8 Using ZonedDateTime and Instant. * * @author JavaProgramTo.com * */ public class MilliSecondsInJava8 < public static void main(String[] args) < // Getting milli seconds from ZonedDateTime class. // Creating zoned date time ZonedDateTime dateTime = ZonedDateTime.now(); // getting the instant from zoned date time Instant instant = dateTime.toInstant(); // Converting Instant time to epoch format milli seconds long timeInMilliSeconds = instant.toEpochMilli(); // print the output System.out.println("Milli seconds from ZonedDateTime : "+timeInMilliSeconds); // Getting the milli seconds from Instant class. // Creating Instant object Instant instantTime = Instant.now(); // Getting millis epoch value timeInMilliSeconds = instantTime.toEpochMilli(); // printing System.out.println("Milli seconds from Instant : "+timeInMilliSeconds); >>

Milli seconds from ZonedDateTime : 1607790957290 Milli seconds from Instant : 1607790957291

5. Conclusion

In this article, we’ve seen how to get the time in milli seconds in java 8 and older versions with examples.

Labels:

SHARE:

About Us

Java 8 Tutorial

• Java 8 New Features
• Java 8 Examples Programs Before and After Lambda
• Java 8 Lambda Expressions (Complete Guide)
• Java 8 Lambda Expressions Rules and Examples
• Java 8 Accessing Variables from Lambda Expressions
• Java 8 Method References
• Java 8 Functional Interfaces
• Java 8 — Base64
• Java 8 Default and Static Methods In Interfaces
• Java 8 Optional
• Java 8 New Date Time API
• Java 8 — Nashorn JavaScript

Java Threads Tutorial

Kotlin Conversions

Kotlin Programs

Java Conversions

• Java 8 List To Map
• Java 8 String To Date
• Java 8 Array To List
• Java 8 List To Array
• Java 8 Any Primitive To String
• Java 8 Iterable To Stream
• Java 8 Stream To IntStream
• String To Lowercase
• InputStream To File
• Primitive Array To List
• Int To String Conversion
• String To ArrayList

Java String API

• charAt()
• chars() — Java 9
• codePointAt()
• codePointCount()
• codePoints() — Java 9
• compareTo()
• compareToIgnoreCase
• concat()
• contains()
• contentEquals()
• copyValueOf()
• describeConstable() — Java 12
• endsWith()
• equals()
• equalsIgnoreCase()
• format()
• getBytes()
• getChars()
• hashcode()
• indent() — Java 12
• indexOf()
• intern()
• isBlank() — java 11
• isEmpty()
• join()
• lastIndexOf()
• length()
• lines()
• matches()
• offsetByCodePoints()
• regionMatches()
• repeat()
• replaceFirst()
• replace()
• replaceAll()
• resolveConstantDesc()
• split()
• strip(), stripLeading(), stripTrailing()
• substring()
• toCharArray()
• toLowerCase()
• transform() — Java 12
• valueOf()

Spring Boot

$show=Java%20Programs

$show=Kotlin

accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,18,Arrays,24,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,8,Collections,37,Collector,1,Command Line,1,Comparator,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,149,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,38,Dictionary,1,Difference,2,Download,1,Eclipse,3,Efficiently,1,Error,1,Errors,1,Exceptions,8,Fast,1,Files,17,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,9,Grant,1,Grep,1,HashMap,2,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,6,Iterate,2,Jackson API,3,Java,32,Java 10,1,Java 11,6,Java 12,5,Java 13,2,Java 14,2,Java 8,128,Java 8 Difference,2,Java 8 Stream Conversions,4,java 8 Stream Examples,12,Java 9,1,Java Conversions,14,Java Design Patterns,1,Java Files,1,Java Program,3,Java Programs,114,Java Spark,1,java.lang,4,java.util. function,1,JavaScript,1,jQuery,1,Kotlin,11,Kotlin Conversions,6,Kotlin Programs,10,Lambda,2,lang,29,Leap Year,1,live updates,1,LocalDate,1,Logging,1,Mac OS,3,Math,1,Matrix,6,Maven,1,Method References,1,Mockito,1,MongoDB,3,New Features,1,Operations,1,Optional,6,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,2,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,31,String,61,String Programs,28,String Revese,1,StringBuilder,1,Swing,1,System,1,Tags,1,Threads,11,Tomcat,1,Tomcat 8,1,Troubleshoot,26,Unix,3,Updates,3,util,5,While Loop,1,

A quick guide to get the current date time in milliseconds using Date, Calendar and java 8 api classes.

Источник